- Laboratories Medical, Havre
- Land Surveyor, Havre - Land Surveying Services
- Landscape Contractors & Designers, Havre
- Landscaping, Havre
- Late Night Restaurants, Havre
- Laundry Self Service, Havre
- Lawn & Garden Equipment & Supplies, Havre
- Lawn & Garden Sprinkler Systems, Havre
- Lawn Mowers & Power Equipment, Havre
- Lawyers & Attorneys, Havre
- Legal Professionals, Havre
- Libraries, Havre
- Life Insurance, Havre
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- Liquor Stores, Havre
- Livestock, Havre
- Loans Personal, Havre
- Local & Short Haul Trucking Companies, Havre
- Locks, Havre
- Locksmiths, Havre - Residence, Commercial, Safe & Auto Car Locksmith
- Locksmiths Equipment & Supplies, Havre
- Lodging, Havre
- Lodging Services, Havre
- Long Haul Trucking Companies, Havre
- Lumber & Lumber Products, Havre
- Lumber & Lumber Products, Havre
- Lutheran Church, Havre
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